Manufacturing method of thin-walled large-diameter pipe with high-pressure copper-nickel alloy for marine engineering
A copper-nickel alloy and marine engineering technology, which is applied in the field of manufacturing thick-walled medium-high pressure copper-nickel alloy large-diameter pipes for liquefied natural gas transmission in marine engineering, can solve the problems of not being able to produce thick-walled large-diameter copper-nickel alloy pipes, etc. Achieve the effect of eliminating residual stress, eliminating processing stress and improving tensile strength
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Embodiment 1
[0021] In this embodiment, the manufacturing method of the super-heavy thick-walled large-diameter medium-high pressure copper-nickel alloy pipe for marine engineering, the specification is that the outer diameter of the pipe is 324mm×the wall thickness is 12.7mm, and the copper-nickel alloy pipe with a length of 6m has a single weight of 665 kg. , Yield strength not less than 125MPa. Its preparation steps are as follows:
[0022] (1) Using copper with a purity of more than 99% and nickel with a purity of more than 99% as raw materials, the alloy melt is smelted in a vacuum induction heating furnace. During the smelting process, electromagnetic stirring is used to continuously vacuumize; the semi-continuous casting process is used to cast the diameter D is a solid round billet of 460mm;
[0023] (2) Boring: the round billet is cooled to normal temperature, and the center of the solid round billet is bored, the diameter of the inner hole is 40 mm, and the inner hole is axially...
Embodiment 2
[0031] In this embodiment, the manufacturing method of super-heavy copper-nickel alloy medium-high pressure pipes for marine engineering, the specification is that the outer diameter of the pipe is 368mm×the wall thickness is 12.7mm, the copper-nickel alloy pipe is 6m long, the weight of a single piece is 758 kg, and the yield strength is not low At 125MPa. Its preparation steps are as follows:
[0032] (1) Using copper with a purity of more than 99% and nickel with a purity of more than 99% as raw materials, the alloy melt is smelted in a vacuum induction heating furnace. During the smelting process, electromagnetic stirring is used to continuously vacuumize; the semi-continuous casting process is used to cast the diameter D is a solid round billet of 460mm;
[0033] (2) Boring: the round billet is cooled to normal temperature, and the center of the solid round billet is bored. The diameter of the inner hole is 60 mm, and the inner hole is axially penetrated for centering; ...
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